Just a short while ago, we got a non-answer on Arqade. Which then got a spam comment from the same 1-rep user. So, I was planning on flagging it as spam.
However, when you actually click on the flag button, you get:
The tooltip for hovering over the comment flag button, though, says, "flag this comment as unconstructive, offensive, or spam".
I seem to be missing a spam option, or there seems to be a small disconnect between what the tooltip says, and what you can actually do with them.
Since I don't believe I've ever seen the option to flag a comment as spam, on any site, might I suggest a small tooltip update?